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IS 1570 (Part 4) 40Ni6Cr4Mo2 vs BS 970 (Part 3) 820M17

Related Material — 69.9% match based on chemical composition and mechanical property overlap.

IS 1570 (Part 4) 40Ni6Cr4Mo2 (IS 1570 (Part 4):1988) and BS 970 (Part 3) 820M17 (BS 970 (Part 3):1991) are both steel grades. Both fall under the Alloy Steel category. IS 1570 (Part 4) 40Ni6Cr4Mo2 is defined under Bureau of Indian Standards (IS), originating from India, while BS 970 (Part 3) 820M17 is defined under British Standards (BS), originating from United Kingdom.

As per chemical composition, IS 1570 (Part 4) 40Ni6Cr4Mo2 vs BS 970 (Part 3) 820M17 is a 74.4% match. Mechanical property data is not available for both grades, so this factor could not be scored. Combined, this makes them a related material overall at 69.9%.

Frequently Compared With IS 1570 (Part 4) 40Ni6Cr4Mo2:
UNI 11234 100Cr6 NF A35-565 100C6 IS 1570 (Part 4) 105Cr5 IS 1570 (Part 4) 10Cr20Mo6 GOST 4543 12HN3A IS 1570 (Part 4) 103Cr4 IS 1570 (Part 4) 103Cr6 GB/T 3077 12Cr2Ni4A IS 1570 (Part 4) 07Cr4Mo6 IS 1570 (Part 4) 10Mo6 IS 4367 07Cr4Mo6 IS 4367 10Cr9Mo10
Match Breakdown
CHEMISTRY MATCH
74.4%
MECHANICAL MATCH
No shared data
OVERALL
69.9%
Specifications
Property IS 1570 (Part 4) 40Ni6Cr4Mo2 BS 970 (Part 3) 820M17
Standard IS 1570 (Part 4):1988 BS 970 (Part 3):1991
Category Alloy Steel Alloy Steel
C (%) 0.35-0.45 0.14-0.20
Si (%) 0.10-0.35 0.10-0.40
Mn (%) 0.40-0.70 0.60-0.90
Ni (%) 1.20-1.60 1.50-2.00
Cr (%) 0.90-1.30 0.80-1.20
Mo (%) 0.10-0.20 0.10-0.20
P (%) Not specified <=0.04
S (%) Not specified <=0.05
Matched by chemical composition and mechanical properties, not a formal equivalence claim. Always verify against the applicable standard before substitution.
Mechanical Properties
Property IS 1570 (Part 4) 40Ni6Cr4Mo2 BS 970 (Part 3) 820M17
Tensile Strength 1090-1240 MPa Not specified
Yield Strength >=830 MPa (0.2 % proof stress) Not specified
Elongation >=11% Not specified
Izod Impact >=41 J Not specified
Hardness 311-363 HBS (guidance only) Not specified
Condition Bars and forgings, hardened and tempered (oil hardened unless stated), limiting ruling section 30 mm Not specified
Typical Applications
IS 1570 (Part 4) 40Ni6Cr4Mo2
Not documented
BS 970 (Part 3) 820M17
Bright cold finished bars (cold drawn, turned or precision ground) for general engineering purposes, in straight lengths; alloy case hardening steel (Table 15)
Key Differences
Can IS 1570 (Part 4) 40Ni6Cr4Mo2 Be Substituted With BS 970 (Part 3) 820M17?
IS 1570 (Part 4) 40Ni6Cr4Mo2 and BS 970 (Part 3) 820M17 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.
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IS 1570 (Part 4) 40Ni6Cr4Mo2
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BS 970 (Part 3) 820M17
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Frequently Asked Questions
What is the difference between IS 1570 (Part 4) 40Ni6Cr4Mo2 and BS 970 (Part 3) 820M17?
BS 970 (Part 3) 820M17 specifies P, S which are not specified for IS 1570 (Part 4) 40Ni6Cr4Mo2.
Can IS 1570 (Part 4) 40Ni6Cr4Mo2 be substituted with BS 970 (Part 3) 820M17?
IS 1570 (Part 4) 40Ni6Cr4Mo2 and BS 970 (Part 3) 820M17 share some compositional similarity but differ enough that substitution should not be assumed. Review the differences above carefully, and consult the applicable standard or a metallurgist before using one in place of the other.